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v3.20.4

Long-Lived Assets - Summary of Aggregate Amortization Related to Customer Contract Costs (Parenthetical) (Details) | 12 Months Ended
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Dec. 31, 2020
Minimum | Customer contract incentives |
Finite Lived Intangible Assets [Line Items] |
Intangible assets, amortization year | 2023
Minimum | Capitalized costs |
Finite Lived Intangible Assets [Line Items] |
Intangible assets, amortization year | 2021
Minimum | Capitalized commission fees |
Finite Lived Intangible Assets [Line Items] |
Intangible assets, amortization year | 2021
Maximum | Customer contract incentives |
Finite Lived Intangible Assets [Line Items] |
Intangible assets, amortization year | 2025
Maximum | Capitalized costs |
Finite Lived Intangible Assets [Line Items] |
Intangible assets, amortization year | 2028
Maximum | Capitalized commission fees |
Finite Lived Intangible Assets [Line Items] |
Intangible assets, amortization year | 2026
Policy election to expense fees as incurred | 1 year

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- Definition Finite-lived intangible assets, amortization year. + References No definition available. + Details
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Namespace Prefix: | csgs_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Definition Policy election to expense fees as incurred. + References No definition available. + Details
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Namespace Prefix: | csgs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |